CN108716575A - A kind of bellows - Google Patents
A kind of bellows Download PDFInfo
- Publication number
- CN108716575A CN108716575A CN201810927699.4A CN201810927699A CN108716575A CN 108716575 A CN108716575 A CN 108716575A CN 201810927699 A CN201810927699 A CN 201810927699A CN 108716575 A CN108716575 A CN 108716575A
- Authority
- CN
- China
- Prior art keywords
- plate
- tube body
- support
- side support
- ripple tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- 229920001903 high density polyethylene Polymers 0.000 description 5
- 239000004700 high-density polyethylene Substances 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 241000826860 Trapezium Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004595 color masterbatch Substances 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L11/00—Hoses, i.e. flexible pipes
- F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
- F16L11/11—Hoses, i.e. flexible pipes made of rubber or flexible plastics with corrugated wall
- F16L11/112—Hoses, i.e. flexible pipes made of rubber or flexible plastics with corrugated wall having reinforcements embedded in the wall
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/12—Rigid pipes of plastics with or without reinforcement
- F16L9/127—Rigid pipes of plastics with or without reinforcement the walls consisting of a single layer
- F16L9/128—Reinforced pipes
Abstract
The present invention relates to a kind of bellowss, including ripple tube body, it is provided with annular support body on the outside of ripple tube body, supporting rack is provided in supporter, supporting rack is circular ring structure and is set in the surface of ripple tube body, supporting rack includes bottom plate and two side support plates, bottom plate is bonded with the outer wall of ripple tube body, side support plate is arranged in the left and right sides of bottom plate and is arranged in parallel with corresponding support side, lateral direction of the U-shaped opening that bottom plate and two side support plates are formed towards ripple tube body, side support plate is elastic plate, two neighboring side support plate can opposite tilt it is close.Supporting rack is arranged in the present invention in bellows, supporting rack can either support the supporter of bellows in radial direction, axial texturization solution axial compressive force can be passed through again, improve the intensity and ring stiffness of tubing, tubing is set to be unlikely to deform, it is effectively prevented accident, substantially increases the safety of tubing.
Description
Technical field
The present invention relates to Bellows Technology field, more particularly to a kind of bellows.
Background technology
HDPE double-wall corrugated pipes, abbreviation PE bellowss are sent out via single kind by the development of more than ten years and perfect
Open up complete product line.Double-wall corrugated pipe is a kind of novel light tubing using high density polyethylene (HDPE) as raw material, is had
The features such as light-weight, high pressure resistant, good toughness, construction be fast, long lifespan, the design of excellent structural pipe wall, the pipe with other structures
Material is compared, and cost substantially reduces.And due to easy to connect, reliable, it is widely used at home and abroad.
In the design of the pipeline configuration of general geological state and landfill depth, it is generally recognized that the tubing of SN8 series can expire
The requirement of sufficient pipe-line system.But actual conditions are, common special material for tube, such as YGH041T, DGDB2480, P600, directly
The grade of SN8 series tubing is far not achieved mostly in 6kN/m2 or so in the pipe ring stiffness produced.In production, although wave
The ring stiffness of line pipe reaches requirement, but other performances may not reach in acceptability limit, especially addition except polyethylene with
When outer ingredient, it be easy to cause the flexibility and processing performance of tubing.Therefore, the ring stiffness of tubing how is effectively improved, and
It maintains other performances in acceptability limit, is a urgent problem.
Invention content
The object of the present invention is to provide a kind of bellowss, improve the anti-pressure ability of bellows.
The present invention above-mentioned purpose technical scheme is that：A kind of bellows, including bellows sheet
Body is provided with annular support body on the outside of the ripple tube body, and the supporter is along the length direction interval of ripple tube body
Setting, the supporter include support top surface and two support sides, and the left side in the support top surface is arranged in the support side
It right both ends and is integrally attached on the ripple tube body, supporting rack is provided in the supporter, support frame as described above is annulus
Structure and the surface for being set in the ripple tube body, support frame as described above include bottom plate and two side support plates, the bottom plate with
The outer wall of the ripple tube body is bonded, the side support plate be arranged the left and right sides of the bottom plate and with corresponding branch
Support side is arranged in parallel, the U-shaped opening that the bottom plate is formed with two side support plates towards the ripple tube body outside
Side direction, the side support plate be elastic plate, two neighboring side support plate can opposite tilt it is close.
Preferably, being hollow structure inside the supporter, the side support plate is fitted in the inner wall of the supporter
On.
Preferably, being provided with elastic top plate on support frame as described above, the U-shaped in support frame as described above is arranged in the elasticity top plate
The both ends of opening, the elasticity top plate are set up separately in two adjacent side support plates, and the elasticity top plate is by both ends to centre
To U-shaped opening inner inclination, make the ends of two adjacent side support plates close to when the elastic top plate the part that tilts
It folds.
When the supporter of bellows is by radial pressure, the support side of supporter is by lateral component, lateral
The end of lower two side support plates in the same supporter of component effect is mutually drawn close, and elastic top plate is made to fold, to
So that the cross section of supporting rack is become triangle by U-shaped, not only alleviate pressure, but also improve the intensity of supporter, further increases
The integral strength and anti-pressure ability of bellows.
Preferably, support frame as described above is split structure, symmetrically it is divided into two semicircles along support frame as described above
The abutting end of ring support, two semicircle ring supports is connected by clamping structure.
Preferably, it includes that setting connects one that the end set of the semicircle ring support, which has connecting plate, the clamping structure,
Card adapter plate on fishplate bar and the clamping chamber being arranged on opposite another connecting plate, the card adapter plate quantity is two, is in herringbone
Shape be arranged on the connecting plate, the clamping chamber be interior lowland be arranged in card adapter plate, it is described be clamped chamber bottom with it is described
Through-hole is formed between card adapter plate, when two semicircle ring supports merge, the card adapter plate stretch into the clamping intracavitary and to
Outer expansion makes the card adapter plate be stretched out on the outside of the clamping chamber from the through-hole.
Preferably, it is provided with fixture block in the card adapter plate, it is described when the card adapter plate is stretched out on the outside of the clamping chamber
Fixture block is connected to the both sides of the bottom of the clamping chamber.
When two semicircle ring support under tensions generate separation trend, since clamping block is connected to clamping bottom of chamber portion
Both sides, for the card adapter plate being unfolded without being collapsed among normal direction, the card adapter plate made is in unfolded state in stress always, thus will
Card adapter plate is fixed on clamping intracavitary, and semicircle ring support is prevented to detach.
Preferably, the junction of the bottom plate and the side support plate is equipped with and is obliquely extended to both sides and is embedded in the wave
Extension inside line tube body.
Beneficial effects of the present invention：Supporting rack is arranged in the present invention in bellows, and supporting rack can either be in radial direction branch
The supporter of bellows is propped up, and can be improved the intensity and ring stiffness of tubing by axial texturization solution axial compressive force, make
Tubing is unlikely to deform, and is effectively prevented accident, substantially increases the safety of tubing.
Description of the drawings
Fig. 1 is the structural schematic diagram of the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of supporter in the embodiment of the present invention；
Fig. 3 is the structural schematic diagram of supporting rack in the embodiment of the present invention；
Fig. 4 is structural schematic diagram when supporting rack separates in the embodiment of the present invention；
Fig. 5 is structural schematic diagram when supporting rack merges in the embodiment of the present invention；
In figure：1- ripple tube bodies, 2- supporters, 21- support side, 22- to support top surface, 3- supporting racks, the first semicircular rings of 31-
Holder, the first connecting plates of 311-, 312- card adapter plates, 313- fixture blocks, 32- the second semicircle ring supports, the second connecting plates of 321-, 322-
Baffle, 323- are clamped chamber, 34- bottom plates, 35- side support plates, 36- elasticity top plates, 37- extensions.
Specific implementation mode
In conjunction with attached drawing, the present invention is described in further detail.This specific embodiment is only explanation of the invention,
It is not limitation of the present invention, and those skilled in the art, can be as needed to this implementation after reading this specification
Example makes the modification of not creative contribution, but as long as all being protected by Patent Law in scope of the presently claimed invention.
Embodiment：As shown in Figures 1 to 5, a kind of bellows, including ripple tube body 1, the ripple tube body 1 it is outer
Side is provided with annular support body 2, and the supporter 2 is arranged along the length direction interval of ripple tube body 1, and supporter 2 includes branch
Support face 22 and two support sides 21, the support side 21 are arranged the left and right ends in the support top surface 22 and integrally connect
It is connected on the ripple tube body 1.Two support 21 opposite tilt of side settings, cross section is trapezium structure.It is set in supporter 2
It is equipped with supporting rack 3, support frame as described above 3 is circular ring structure and is set in the surface of the ripple tube body 1, and support frame as described above 3 wraps
Bottom plate 34 and two side support plates 35 are included, the bottom plate 34 is bonded with the outer wall of the ripple tube body 1, the side support plate 35
It is arranged in the left and right sides of the bottom plate 34 and is arranged in parallel with corresponding support side 21, the bottom plate 34 and two institutes
The U-shaped opening of the formation of side support plate 35 is stated towards the lateral direction of the ripple tube body 1, the side support plate 35 is elasticity
Plate, two neighboring side support plate 35 can opposite tilt it is close.2 inside of supporter is hollow structure, and the side support plate 35 is bonded
On the inner wall of the supporter 2.
As shown in Fig. 2, being provided with elastic top plate 36 on supporting rack 3, the elasticity top plate 36 is arranged in support frame as described above 3
At U-shaped opening, the both ends of the elasticity top plate 36 are set up separately in two adjacent side support plates 35, and the elasticity top plate 36 is by two
Hold make to centre to U-shaped opening inner inclination the ends of two adjacent side support plates 35 close to when the elastic top plate 36
It tilts partially folded.
As shown in Fig. 3, Fig. 4 and Fig. 5, supporting rack 3 is split structure, is symmetrically divided into two along supporting rack 3
Semicircle ring support, including the first semicircle ring support 31 and the second semicircle ring support 32, the end set of the first semicircle ring support 31
There are the first connecting plate 311, the end set of the second semicircle ring support 32 to have the second connecting plate 321,31 He of the first semicircle ring support
The abutting end of second semicircle ring support 32 is connected by the clamping structure between the first connecting plate 311 and the second connecting plate 321.Card
Binding structure includes the card adapter plate 312 being arranged on the first connecting plate 311 and the clamping chamber 323 that is arranged on the second connecting plate 321,
312 quantity of card adapter plate is two, is arranged on the connecting plate in herringbone.It is that interior lowland is arranged in card adapter plate to be clamped chamber 323
On 312, the bottom of clamping chamber 323 is equipped with baffle 322, and through-hole is formed between baffle 322 and card adapter plate 312.As shown in figure 5, working as
When two semicircle ring supports merge, card adapter plate 312 stretches into clamping chamber 323, by after the blocking of baffle 322 to abduction
It opens, card adapter plate 312 is made to stretch out 323 outside of the clamping chamber from through-hole.Fixture block 313 is provided in card adapter plate 312, when the clamping
When plate 312 stretches out clamping 323 outside of chamber, the fixture block 313 is connected to the two of the baffle 322 of 323 bottom of the clamping chamber
Side.Bottom plate 34 and the junction of side support plate 35 are equipped with the extension for being obliquely extended and being embedded in inside ripple tube body 1 to both sides
37。
A kind of production method of bellows, includes the following steps：
A, it takes calcium carbonate, talcum powder to be uniformly mixed with high density polyvinyl-chloride, is sent into double screw extruder and squeezes out, it is cooling, it makes
Grain obtains modification high-density polyethylene particle, and the wherein mass ratio of calcium carbonate, talcum powder and high density polyvinyl-chloride is 1：3：
96；
B, it is 100 according to mass ratio by modification high-density polyethylene particle and color masterbatch：2.5 ratio is uniformly mixed, and is mixed
Material；
C, the obtained mixtures of step B are delivered to extruder, the heating plasticizing in the machine barrel of extruder passes through the machine of extruder
Head squeezes out pipe, while installing supporting rack 3 to pipe in head；
D, and then pipe passes through forming machine compression molding, cooling and shaping.
In step C, the opening of supporting rack 3, the first semicircle ring support 31 and the second semicircle ring support difference is arranged in head
Enter in head from both sides, rear enclosure is connected on pipe by clamping structure.The lathe channel of head is provided with two layers, is squeezed out
Supporting rack 3 is installed when first layer pipe, the second layer is then squeezed out again, the mixture of plasticizing is made to wrap up pipe and supporting rack 3, then
Annular support body 2 is extruded by forming machine, and keeps the position of supporter 2 corresponding with the position of supporting rack 3.
Claims (7)
1. a kind of bellows, including ripple tube body（1）, the ripple tube body（1）Outside be provided with annular support body
（2）, the supporter（2）Along ripple tube body（1）Length direction interval setting, the supporter（2）Including supporting top surface
（22）With two support sides（21）, the support side（21）It is arranged in the support top surface（22）Left and right ends and one
It is connected to the ripple tube body（1）On, it is characterised in that：The supporter（2）Inside it is provided with supporting rack（3）, the support
Frame（3）For circular ring structure and it is set in the ripple tube body（1）Surface, support frame as described above（3）Including bottom plate（34）With two
A side support plate（35）, the bottom plate（34）With the ripple tube body（1）Outer wall fitting, the side support plate（35）Setting
In the bottom plate（34）The left and right sides and with corresponding support side（21）It is arranged in parallel, the bottom plate（34）With two
The side support plate（35）The U-shaped opening of formation is towards the ripple tube body（1）Lateral direction, the side support plate（35）
For elastic plate, two neighboring side support plate（35）Can opposite tilt it is close.
2. a kind of bellows according to claim 1, it is characterised in that：The supporter（2）Inside is hollow structure, institute
State side support plate（35）It is fitted in the supporter（2）Inner wall on.
3. a kind of bellows according to claim 2, it is characterised in that：Support frame as described above（3）On be provided with elastic top plate
（36）, the elasticity top plate（36）It is arranged in support frame as described above（3）U-shaped opening at, it is described elasticity top plate（36）Both ends point
It is located at two adjacent side support plates（35）On, the elasticity top plate（36）From both ends to centre to U-shaped opening inner inclination, make
Two adjacent side support plates（35）End close to when the elastic top plate（36）Tilt it is partially folded.
4. a kind of bellows according to claim 1, it is characterised in that：Support frame as described above（3）For split structure, along institute
State supporting rack（3）Be symmetrically divided into two semicircle ring supports, the abutting end of two semicircle ring supports passes through clamping structure
Connection.
5. a kind of bellows according to claim 4, it is characterised in that：The end set of the semicircle ring support has connection
Plate, the clamping structure include the card adapter plate being arranged on a connecting plate（312）Be arranged on opposite another connecting plate
It is clamped chamber（323）, the card adapter plate（312）Quantity is two, is arranged on the connecting plate in herringbone, the clamping chamber
（323）It is arranged in card adapter plate for interior lowland（312）On, the clamping chamber（323）Bottom and the card adapter plate（312）Between shape
At through-hole, when two semicircle ring supports merge, the card adapter plate（312）Stretch into the clamping chamber（323）It is interior and outside
Expansion, makes the card adapter plate（312）The clamping chamber is stretched out from the through-hole（323）Outside.
6. a kind of bellows according to claim 5, it is characterised in that：The card adapter plate（312）On be provided with fixture block
（313）, when the card adapter plate（312）Stretch out the clamping chamber（323）When outside, the fixture block（313）It is connected to the clamping
Chamber（323）Bottom both sides.
7. a kind of bellows according to claim 1, it is characterised in that：The bottom plate（34）With the side support plate（35）
Junction be equipped be obliquely extended to both sides and be embedded in the ripple tube body（1）Internal extension（37）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810927699.4A CN108716575B (en) | 2018-08-15 | 2018-08-15 | Corrugated pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810927699.4A CN108716575B (en) | 2018-08-15 | 2018-08-15 | Corrugated pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108716575A true CN108716575A (en) | 2018-10-30 |
| CN108716575B CN108716575B (en) | 2024-03-22 |
Family
ID=63914039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810927699.4A Active CN108716575B (en) | 2018-08-15 | 2018-08-15 | Corrugated pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108716575B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10139897C1 (en) * | 2001-08-14 | 2003-02-27 | Kirchner Fraenk Rohr | Ribbed pipe, for connecting units, e.g. pumps, to carry liquids, has sealing structures at the rib peaks and/or valleys, to give a self-sealing connection when pushed into a connector |
| CN202149297U (en) * | 2011-07-26 | 2012-02-22 | 福建振云塑业股份有限公司 | Anti-buckling double-wall corrugated pipe |
| CN203215110U (en) * | 2013-04-19 | 2013-09-25 | 辽宁盛象塑料管业有限公司 | Galvanized steel strip enhanced polyethylene helical bellows |
| CN203549167U (en) * | 2013-09-18 | 2014-04-16 | 上海中塑管业有限公司 | Steel-belt-reinforced spiral corrugated pipe |
| CN204962078U (en) * | 2015-09-25 | 2016-01-13 | 徐胜 | Bury ground for drainage polyethylene double -walled corrugated pipe use annular steel hoop |
| CN208735052U (en) * | 2018-08-15 | 2019-04-12 | 浙江康泰管业科技有限公司 | A kind of bellows |
-
2018
- 2018-08-15 CN CN201810927699.4A patent/CN108716575B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10139897C1 (en) * | 2001-08-14 | 2003-02-27 | Kirchner Fraenk Rohr | Ribbed pipe, for connecting units, e.g. pumps, to carry liquids, has sealing structures at the rib peaks and/or valleys, to give a self-sealing connection when pushed into a connector |
| CN202149297U (en) * | 2011-07-26 | 2012-02-22 | 福建振云塑业股份有限公司 | Anti-buckling double-wall corrugated pipe |
| CN203215110U (en) * | 2013-04-19 | 2013-09-25 | 辽宁盛象塑料管业有限公司 | Galvanized steel strip enhanced polyethylene helical bellows |
| CN203549167U (en) * | 2013-09-18 | 2014-04-16 | 上海中塑管业有限公司 | Steel-belt-reinforced spiral corrugated pipe |
| CN204962078U (en) * | 2015-09-25 | 2016-01-13 | 徐胜 | Bury ground for drainage polyethylene double -walled corrugated pipe use annular steel hoop |
| CN208735052U (en) * | 2018-08-15 | 2019-04-12 | 浙江康泰管业科技有限公司 | A kind of bellows |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108716575B (en) | 2024-03-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1807959A (en) | Connector for connecting two pipes | |
| CN109676985B (en) | Secondary expansion bonding method for semi-steel passenger radial tire rubber | |
| CN208735052U (en) | A kind of bellows | |
| CN102725121B (en) | Device and method for calibrating film tubing | |
| CN102886898A (en) | Special clamp of electric fusion welding machine for reinforced plastic composite tube | |
| CN1842672A (en) | A sealing device for temporarily closing a well or a pipe | |
| CN208951454U (en) | A kind of pressure resistance bellows | |
| CN1170081C (en) | Pipe joint and method of making pipe joint | |
| CN108716575A (en) | A kind of bellows | |
| WO2017024747A1 (en) | Composite tube/film with intermediate layer of diamond grid framework, and forming method and device therefor | |
| CN108758119A (en) | A kind of pressure resistance bellows | |
| CN101649933A (en) | Enhanced plastic double-walled corrugated pipe and manufacturing method thereof | |
| CN108662322B (en) | Rotational molding joint for hollow wall winding pipe | |
| CN202895699U (en) | Special electric fusion welding machine clamping apparatus of reinforced plastic composite pipe | |
| CN111637306B (en) | Quick butt joint fixing device for PE water supply pipe | |
| CN112460340A (en) | Novel multifunctional composite pipe and production process thereof | |
| CN210510573U (en) | High-impact-resistance vinyl chloride double-wall corrugated pipe | |
| CN204566662U (en) | The outer winding pipe coating mould of a kind of carat pipe and carat tubular construction | |
| KR101588213B1 (en) | Method for connecting large diameter pipes | |
| CN217323896U (en) | Automatic filling machine for molecular sieve | |
| JP6030881B2 (en) | Corrugated plastic tube | |
| CN207049467U (en) | A kind of square single-wall corrugated pipes of SFIP | |
| CN220337751U (en) | Spliced HDPE corrugated pipe | |
| CN109291400B (en) | Expandable extrusion die | |
| CN216843464U (en) | HDPE inner rib winding pipe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |